linux-kernel - Re: [Xen-devel] [PATCH v9 4/5] x86/PCI: Enable a 64bit BAR on AMD Family 15h (Models 30h-3fh) Processors v5

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Date:   Tue, 28 Nov 2017 02:46:53 -0700
From:   "Jan Beulich" <JBeulich@...e.com>
To:     "Christian König" <christian.koenig@....com>
Cc:     <helgaas@...nel.org>, <amd-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>,
        "xen-devel" <xen-devel@...ts.xen.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v9 4/5] x86/PCI: Enable a 64bit BAR on
 AMD Family 15h (Models 30h-3fh) Processors v5

>>> On 28.11.17 at 10:12, <christian.koenig@....com> wrote:
> In theory the BIOS would search for address space and won't find 
> anything, so the hotplug operation should fail even before it reaches 
> the kernel in the first place.

How would the BIOS know what the OS does or plans to do? I think
it's the other way around - the OS needs to avoid using any regions
for MMIO which are marked as hotpluggable in SRAT. Since there is
no vNUMA yet for Xen Dom0, that would need special handling.

Jan